Targeted site specific drug delivery compositions and method...

A - Human Necessities – 61 – K

Patent

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Details

A61K 47/48 (2006.01) A61K 41/00 (2006.01) A61K 49/00 (2006.01) A61K 49/22 (2006.01)

Patent

CA 2337361

The invention relates to pharmaceutical compositions and methods for delivery of therapeutic agents. The methods and composition of the invention can achieve site specific delivery of a therapeutic substance, allowing for lower doses and for improved efficacy, particularly for agents such as oligonucleotides which have presented problems in reaching targeted sites in necessary therapeutic levels. Targeted introduction of ultrasound can be used to promote release of the therapeutic agent. The delivery system includes protein-encapsulated gas-filled microbubbles formed in an N2-depleted or N2-free environment. These microbubbles are smaller and more stable than microbubbles sonicated in the presence of room air.

La présente invention concerne des compositions pharmaceutiques et des procédés d'administration d'agents thérapeutiques. Les procédés et la composition de l'invention permettent d'effectuer une administration spécifique de site d'une substance thérapeutique, par conséquent à des doses inférieures et avec une plus grande efficacité, en particulier dans le cas d'agents tels que les oligonucléotides qui rencontrent des difficultés pour atteindre les sites cibles aux niveaux thérapeutiques nécessaires. L'introduction ciblée d'ultrasons peut être utilisée pour favoriser la libération de l'agent thérapeutique. Le système d'administration de l'invention comprend des microbulles remplies de gaz encapsulées dans des protéines formées dans un milieu pauvre ou dépourvu de N¿2?. Ces microbulles sont plus petites et plus stables que les microbulles formées par traitement aux ultrasons en présence d'air ambiant.

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